Flow of Energy Lab

Flow of Energy Lab

Pre-Lab Questions:

1. Explain the difference between exothermic and endothermic. Give an example of each.

2. Show in a model how the heat will flow if a hot coffee is left on a table.  In addition, show how the molecules are moving in the coffee and in the room around it.

Make your hypothesis:  Explain what will happen if a hot liquid and a cold liquid will come in contact with each other. Make sure to explain in terms of heat flow and the movement of the molecules.

Design your experiment:

Instructions—

1. Conduct three different experiments of heat flow between a cold and hot liquid. How much liquid, the temperature of the liquids, and how the liquids interact is up to you.  You may put the liquids next to each other or put them inside each other in separate containers.

2. Measure temperature regularly by timing the experiment on your phone.

3. It is your decision for how long to carry out the experiment and when to collect data.

4. Make a data table for each experiment of the three experiments, note on the data table what equipment is used.

5. Your data should be able to be made into a graph showing the temperature over time.

Data Table:

Equipment used: (Write down all of the equipment that you used)

(Make the data table as big as you need for a long as you take measurement.)

Time:	Hot Water Temperature:	Cold Water Temperature:

Jobs:

Longest hair: Set up/Recorder

Next longest hair: Clean up/Measure hot water temperature

Next longest hair: Set up/Measure cold water temperature

Shortest hair: Clean up/Timer

Analyzing:

1. Create two graphs of your data. Each graph is a different data table and experiment. On the x-axis place the time and on the y-axis place the temperature. Use a different colored pencil for to graph the hot and cold water in your graph.

2. Did any of your experiments reach a temperature equilibrium between the hot and cold water? If it did reach equilibrium tell which ones did and explain why. If it didn’t, explain why or why not you think it will reach a temperature equilibrium.

3. Look at your data and graphs, did the type of materials you used such as glass, plastic or Styrofoam effect the temperature change? (Hint: did it change temperature faster or slower?) Explain why. 

4. Did the amount of hot or cold water have an effect on the temperature change? Explain how it affect the temperatures in your data. (Hint: look at your data to see how quickly or slowly hot or cold water changed temperature.)